Now we are planning to implement IP phones in the network. so management has decided to add one more core switch and fiber uplink to all the switches. so in this senario what would be the best redundant design setup we can have in our network.

Kindly help me to finish the design diagram with all mentioned devices.

1) I would connect the two core switches with two fiber pairs and I would configure a L2 trunk etherchannel.

If you have only one port free a single L2 trunk can be enough.

2) yes it is the right decision it allows you to have a hierarchical network with a core layer and an access layer: no access layer device relies on another access layer device to reach the core and this is good.

1) I would connect the two core switches with two fiber pairs and I would configure a L2 trunk etherchannel.

If you have only one port free a single L2 trunk can be enough.

2) yes it is the right decision it allows you to have a hierarchical network with a core layer and an access layer: no access layer device relies on another access layer device to reach the core and this is good.